Geochemical and lithological justification of "the main source" concept of pre-Jurassic oil deposits in Krasnoleninsk arch (Tyumen region)
Genesis of oil deposits of pre-Jurassic complex in Western Siberia is a subject of heated debates. It is conventional that the accepted concept of "the main source" of hydrocarbons in pre-Jurassic deposits defines the strategy of their searches. The authors have justified "the main so...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2019-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/1273 |
| Summary: | Genesis of oil deposits of pre-Jurassic complex in Western Siberia is a subject of heated debates. It is conventional that the accepted concept of "the main source" of hydrocarbons in pre-Jurassic deposits defines the strategy of their searches. The authors have justified "the main source" concept on the basis of the system analysis of geochemical and lithologic and petrographic data. The core material from Apt-Senoman, Middle and Upper Jurassic complexes and pre-Jurassic sedimentary-igneous formations of productive and unproductive wells of North Rogozhnikovskoye and Rogozhnikovskoye fields of the Krasnoleninsk arch was studied layer-by-layer. Lithologic and petrografichic features of rocks were studied in transparent sections and in those painted over with rasin by the method of optical microscopy. The content in rock and molecular mass composition of mobile hydrocarbons of oil row were determined by geochemical researches. The authors determined the interstratal migration direction by their change orientation. In a section of Jurassic and Triassic age two vertical zones of intersheeted migration of hydrocarbons were revealed. The first is within the Upper Jurassic deposits, the second is within Middle-Jurassic and top of the Triassic breeds. Oil deposits were formed in Triassic complex in upper parts of effusive massifs, in fracturing and hydrothermal reaming areas. Oil deposits in Triassic collectors were formed as a result of hydrocarbon intake from bottoms of the Tyumen suite. The results of the joint analysis of geochemical and litological and petrophysical data on North Rogozhnikovskoye and Rogozhnikovskoye fields prove the concept of the Jurassic source of hydrocarbons of pre-Jurassic basis deposits. |
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| ISSN: | 2500-1019 2413-1830 |